I am 40 and have been going grey since my early twenties, I think I am probably 60% grey/white on the crown of my head. I have naturally dark brown hair so the roots are really visible after only 3-4 weeks. I have tried having hightlights to hide the regrowth but I really don't suit lighter hair colours. I've been considering whether to dye my whole head dark grey/steel grey - something like this colour. My hair is a chin length Bob with a fringe. Will this just add years to me? I am fairly wrinkle free and cool colouring. Any thoughts anyone? Or better ideas?